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rdtsc.h
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rdtsc.h
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// http://www-unix.mcs.anl.gov/~kazutomo/rdtsc.html
#ifndef IRK_RDTSC_H
#define IRK_RDTSC_H
#if defined(__llvm__)
uint64_t rdtsc(void) __asm__ ("llvm.readcyclecounter");
#elif defined(__i386__)
static __inline__ unsigned long long rdtsc(void)
{
unsigned long long int x;
__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
return x;
}
#elif defined(__x86_64__)
static __inline__ unsigned long long rdtsc(void)
{
unsigned hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ( (unsigned long long)lo)|( ((unsigned long long)hi)<<32 );
}
#elif defined(__ppc64__)
static __inline__ unsigned long long rdtsc(void)
{
unsigned long long int result=0;
unsigned long int upper, lower,tmp;
__asm__ volatile(
"0: \n"
"\tmftbu %0 \n"
"\tmftb %1 \n"
"\tmftbu %2 \n"
"\tcmpw %2,%0 \n"
"\tbne 0b \n"
: "=r"(upper),"=r"(lower),"=r"(tmp)
);
result = upper;
result = result<<32;
result = result|lower;
return(result);
}
#elif defined(__ppc__)
static __inline__ unsigned long long rdtsc(void)
{
unsigned long long int result=0;
unsigned long int upper, lower,tmp;
__asm__ volatile(
"0: \n"
"\tmftbu %0 \n"
"\tmftb %1 \n"
"\tmftbu %2 \n"
"\tcmpw %2,%0 \n"
"\tbne 0b \n"
: "=r"(upper),"=r"(lower),"=r"(tmp)
);
result = upper;
result = result<<32;
result = result|lower;
return(result);
}
#elif defined(__riscv) && (__riscv_xlen == 64)
static __inline__ unsigned long rdtsc(void)
{
unsigned long result;
__asm__ volatile ("rdcycle %0" : "=r" (result));
return result;
}
#else
error ("no rdtsc() on this platform?");
#endif
#endif // IRK_RDTSC_H